Combine tomato sauce, chili powder, and cumin in a lightly greased 9" quiche dish. Break eggs over sauce, arranging evenly in dish. Sprinkle with pepper and paprika. Cover and bake at 350~ for 15 to 20 mins. Sprin= kle with cheese and bake an additional 5 mins. Or to desired degree of doneness. Spoon eggs onto tostada shells; top w/dollop of sour cream. Garnish w/jalapeno pepper slices, if desired.